Process for dyeing fiber materials of synthetic polyamides with acid dyestuffs

ABSTRACT

WHEREIN Ar is an aromatic radical; R1 and R2 are H, cycloalkyl, aralkyl aryl or optionally substituted alkyl and together contain at least six carbon atoms; R3 is alkylene or aralkylene; n is 0 or 1; and Me is a cation.   Process for dyeing synthetic polyamide fiber materials with acid dyestuff containing dye bath, the improvement comprising including in said dye bath, 0.5 to 2 percent by weight of the polyamide to be dyed, an aromatic sulfonic acid of the following formula:

United States Patent Inventors Appl. No.

Priority Klaus Wall Leverkusen-Wiesdort;

Walter Hees, CoIogne-I'Ioehenberg; Mathieu Quaedvlleg. Opladen, all of Germany July 29, 1968 Nov. 9, 1 971 Farbenfabriken Bayer Aktiengesellschait Leverkusen, Gennany Aug. 7, 1967 Germany PROCESS FOR DYEING FIBER MATERIALS 0F SYNTHETIC POLYAMIDES WITH ACID DYESTUFFS 8 Claims, No Drawings US. Cl

References Cited 3,39I,985 7/l968 Turbuchenctal 3,402,014 9/1968 Ucci Primary Examiner-George F Lesmes Assistant Examiner-T. .I. Herbert Att0rneyPlum|ey, Tyner & Sandt ABSTRACT: Process for dyeing synthetic polyamide fiber materials with acid dyestufi' containing dye bath, the improvewherein Ar is an aromatic radical; R and R,are H, cycloalkyl, aralkyl aryl or optionally substituted alkyl and together contain at least six carbon atoms; R, is alkylene or aralkylene; n is 0 or I; and Me is a cation.

PROCESS FOR DYEING FIBER MATERIALS F SYNTHETIC POLYAMIDES WITH ACID DYESTUFFS The present invention relates to a process for dyeing fiber materials of synthetic polyamides with acidic dyestuffs. More particularly it concerns a process wherein the dyeing is carried out in the presence of aromatic sulfonic acids of the fonnula in which Ar denotes an aromatic radical, especially a benzene or naphthalene radical;

R, and R, independently of one another, denote hydrogen,

a cycloalkyl, aralkyl or aryl radical or an optionally substituted alkyl radical,

R stands for an alkylene or an aralkylene radical;

n is the number 0 or 1; Me is a cation;

R, and R together must contain at least six carbon atoms.

With regard to the symbols R, and R, the alkyl radicals primarily comprise those with one to 20 carbon atoms, for example, methyl, ethyl, i-propyl, hexyl, nand i-octyl, nonyl, decyl, nand i-dodecyl and hexadecyl radicals; the cycloalkyl radicals primarily include cyclohexyl radicals; the aralkyl radicals primarily include benzyland phenyl-ethyl radicals; and the aryl radicals are primarily phenyl and naphthyl radicals.

As substituents for the alkyl radicals are primarily mentioned hydroxy and carboxy groups.

For R are mentioned as alkylene radicals primarily the ethylene radical and the substituted ethylene radicals, such as the propylene-1,2, butylene-l,2, and the 3-hydroxypropylene- 1,2, radical and as aralkylene radicals primarily the phenyl ethylene radical.

Suitable cations Me are mainly the alkali metal ions, the ammonium ion and ammonium ions containing lower alkyl radicals, such as methyl, ethyl, 2-hydroxyethyl or cyclohexyl radicals.

The compounds to be used according to the indexation can be prepared by sulfonation of hydroxyl compounds of the general formula in which Ar R, R R and n have the same meaning as above, with sulfonating agents, such as sulfuric acid, sulfur trioxide, chlorosulfonic acid or amidosulfonic acid. Examples of hydroxyl compounds are hexylphenol, octylphenol, nonylphenol, dodccylphenol, hexadecylphenol,. reaction products of oleyl alcohol or oleic acid with phenol or cresol, dibutylphenol, dihexylphenol, nonylcresol, cyclohexylphenol, cyclohexylethyl-phenol, hydroxydiphenyl, hydroxydiphenylmethane, hydroxydiphenyl-propane, heptylnaphthol, and their reaction products with alkylene oxides, such as ethylene oxide, propylene oxide, butylene oxide, glycide and styrene oxide, or alkylene oxide mixtures.

The necessary amounts of compounds of the formula (I) to be used according to the invention can easily be established by preliminary experiments. In general, amounts of about 0.5 to 2 percent referred to the weight of material to be dyed, have proved satisfactory. For the process according to the invention such acid dyestufis are used which usually serve for dyeing synthetic polyamide fiber materials.

The dyeing process according to the invention is suitable for all synthetic polyamides, such as polycaprolactam, polyhexamethylene-diamine adipate, or poly-l l-amino-undecanic acid.

Dyeing of the polyamide fiber materials is usually carried out by introducing the material to be dyed in a lignor ratio of I: 10-40 into an aqueous bath which has been heated to about 40 to 50 C. and contains the acidic dyestuffs, the compounds of the fonnula (I) to be used according to the invention, and acids, such as acetic acid or formic acid, then gradually raising the temperature of the dyebath to approximately C. and keeping the dyebath at this temperature until it is exhausted. However, it is also possible to pretreat the polyamide material to be dyed, prior to the dyeing process proper, with a liquor which contains only the compounds of the formula (I) to be used according to the invention and the usual acids, by heating the material to be dyed in this liquor at 130C. for about 5-20 minutes. After cooling to 40 C., the dyestuffs are added to the liquor which is then gradually heated to 98 to C. and kept at this temperature for about 1 hour.

With the aid of the process according to the invention it is possible to dye the most varied materials of polyamide fibers, for example, flocks, cable sheathings, combed materials, yams, fabn'cs, knitted fabrics or fleeces, with acidic dyestuffs in outstanding levelness; in particular, the streakiness which easily occurs in the dyeing of fabrics and knitted fabrics of synthetic polyamides, is obviated.

The dyestuff numbers given in the following examples refer to Color Index, 2nd Edition, Volume 3.

EXAMPLE 1 A fabric of polycaprolactam filaments is introduced in a liquor ratio of 1:40 into a bath which has been heated to 40 C. and contains, per liter, 0.065 g. of the dyestuff No. 18,835; 0,033 g. of the dyestuff No. 17,070; 0.055 g. of the dyestuff No. 62,055; 0.3 g. ofglacial acetic acid and 0.35 g. of the compound of the fonnula OH:

SO NB The dye bath is gradually heated to 98 C. and kept at this temperature for about 60 minutes. A grey dyeing of outstanding levelness is obtained.

Equally good results can be obtained when the levelling agent used above is replaced with one of the following compounds:

EXAMPLE 2 A knitted fabric of polyhexamethylene-diamine adipate fila ments is introduced in a liquor ratio of 1:30 into a both which has been heated to 40 C. and contains, per litre, 0.4 g. glacial acetic acid and 0.5 g. of the compound SOgNB.

The bath is gradually heated to C. and kept at this temperature for a short time. It is then cooled to 40 C. Subsequently there are added, per liter of liquid, 0.09 g. of the dyestuff No. 18,835; 0.043 g. of the dyestuff No. 17,070; and 0.1 g. of the dyestuff described in the third paragraph of example l of German Pat. specification No. 823,9l2. The dyebath is gradually healed to 1 C. and kept at this temperature for about 60 minutes. A silver-grey dyeing of outstanding levelness is obtained.

Equally good results can be obtained when the levelling agent used above is replaced with the following compounds:

SOiNa S OgNB SOaNS.

We claim:

1. In the process for dyeing fiber materials of synthetic polyamides with a dye bath containing acidic dyestuffs, the improvement comprising including in said dye bath an aromatic sulfonic acid of the formula R, some in which Ar is an aromatic radical;

R and R independently of one another, are hydrogen, cycloalkyl, aralkyl, aryl or optionally substituted alkyl radicals;

R is an alkylene or an aralkylene radical;

n is 0 or 1;

Me is a cation; and

R, and R together contain at least six carbon atoms;

2. The process of claim I wherein said aromatic sult'onic acid has the formula wherein R, R, and Me have the same meaning as set forth in claim I.

it, Soon- 3. The process of claim 1 wherein R and R are selected from the group consisting of alkyl containing one to 20 carbon atoms; cyclohexyl; benzyl; phenyLethyI; dimethyl benzyl; phenyl and naphthyl,

4. The process of claim I wherein said aromatic sulfonic acid comprises 0.5 to 2 percent by weight of the polyamide to be dyed,

5. Synthetic polyamide fiber materials dyed according to the process of claim 1.

64 A composition for dyeing synthetic polyamide fiber materials comprising acid dyestuffs and an aromatic sulfonic acid of the formula 8. The dyeing composition of claim 6 wherein R and R are selected from the group consisting of alkyl containing one to 20 carbon atoms; cyclohexyl; benzyl', phenyl-ethyl; dimethyl benzyl, phenyl and naphthyl.

# t t i t UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. I Dated Nov. 9, 1971 l. Inventor(s) walz: laus, et a It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column Ling Error 2 63 "both" should read --bath.

formula R CH R SO MG should read page 2 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 ,6l9,l23 Dated Nov. 9 1971 Inventor(s) walz I Klaus et al It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column Line Error 4 Cl. 2 "wherein R R and Me have the same meaning as set forth in Claim 1 should follow the formula not precede it.

4 Cl. 3 "dimethyl benzyl" should read 0 ,UK *dimethyl benzyl--.

4 Cl. 7 formula {\r- (O-R3) -O-SO M 3 R2 SO Me should read Ar-O-CH i 2 CH 0 503MB 2 SO Me M FO-105O (10-69) USCOMM-DC 603764 69 page 3 UNITED STA'ETES PATENT OFFICE CERTIFICATE GP CORRECTION Patent No. 3r6l9rl23 Dated 197]- Inventor(s) walz' Klaus: et a1.

It is certified that error appears in the above identified patent and that said Letters Patent are hereby corrected as shown below:

4 Cl. 7 "wherein R R and Me have the same meaning as set forth in Claim 6' should follow the formula not precede 4 c1. 8 "dimethylbenzyl" should read dimethylbenzy1- Signed and sealed this 20th day of June 1972.

Attest:

ll TIW! .R "J M a F In ECH 15R, JR HO BERT GO TT SCHALK mt -gi Officer Commissioner of Patents )RM F'O-1050 (10-69) USCOMM-DC 6037G-PBQ 

2. The process of claim 1 wherein said aromatic sulfonic acid has the formula wherein R1, R2 and Me have the same meaning as set forth in claim
 1. 3. The process of claim 1 wherein R1 and R2 are selected from the group consisting of alkyl containing one to 20 carbon atoms; cyclohexyl; benzyl; phenyl-ethyl; dimethyl benzyl; phenyl and naphthyl.
 4. The process of claim 1 wherein said aromatic sulfonic acid comprises 0.5 to 2 percent by weight of the polyamide to be dyed.
 5. Synthetic polyamide fiber materials dyed according to the process of claim
 1. 6. A composition for dyeing synthetic polyamide fiber materials comprising acid dyestuffs and an aromatic sulfonic acid of the formula wherein Ar is an aromatic radical; R1 and R2, independently of one another, are hydrogen, cycloalkyl, aralkyl, aryl or optionally substituted alkyl radicals; R3 is an alkylene or aralkylene radical; n is 0 or 1; Me is a cation; and R1 and R2 together contain at least six carbon atoms.
 7. The dyeing composition of claim 6 wherein said aromatic sulfonic acid has the formula wherein R1, R2 and Me have the same meaning as set forth in claim
 6. 8. The dyeing composition of claim 6 wherein R1 and R2 are selected from the group consisting of alkyl containing one to 20 carbon atoms; cyclohexyl; benzyl; phenyl-ethyl; dimethyl benzyl, phenyl and naphthyl. 